Human Circulatory System
Many factors, such as temperature, oxygen supply or nervous excitement, affect heartbeat and circulation. Blood circulation is controlled mainly via nerve connections, sensory receptors and hormones.
Circulatory system transports essential gases and nutrients around the body, removes unwanted products produced during metabolism from the tissues, and carries these products to specialized excretory organs.
The circulatory system forms a complex communication and distribution network to all active tissues of the body. A constant supply of oxygen is required. The well-being of the four chambered heart is crucial for transportation of energy to various organs of body. Oxygen is transported by the red blood cells.
The circulatory system is closed such that fluids course through vessels, but there is free movement of cells in and out of blood.
Some white blood cell movement out of the capillaries and fluid leakage are observed in all tissues. Blood tissues are distinctive in the range of specialized cells.
1. Blood floods into the relaxed atria.
2. The wave of contraction squeezes the atria, driving blood into ventricles.
3. Blood squeezed in the ventricles pushes open the semi lunar valves.
4. The ongoing contraction drives blood into arteries.
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Introduction To Human Body Systems
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lapasan | Nov 6, 2010 | Reply
good post.
albert1jemi | Nov 6, 2010 | Reply
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Kristie Claar | Oct 15, 2011 | Reply
informative post